...vedic mathematics...

This blog deals with various sutras mentioned by Sri Bharati Krshna Thirtha swamiji and taught by Sri Avadhanulu garu to me(Kaushik).

Introduction...

I would like to thank my guru Sri Avadhanulu-garu on behalf of all his students for his efforts and able guidance in teaching us vedic mathematics. He is a scholarly man who has dedicated his life to educate people, giving them a scientific approach to vedas. Being a strong believer in Sanathana dharma, he has always worked hard so that it reaches to as many as possible. He has also written many commentaries on vedic mathematics. He has recently published a book on 'Scope for research work in vedas in science and technology'(i dont know the exact titleof the book, but is very close to this one).

The term Vedic Mathematics refers to a set of sixteen mathematical formulae or sutras and their corollaries derived from the Vedas.

In the following posts i will be writing commentaries on various sutras of vedic mathematics as told by Jagadguru Swami Shri Bharati Krishna Tirtha swamiji . I hope it would be helpful to everyone.

On request to many co-bloggers, I am providing the contact details of my teacher, you can contact him through the webiste:

What is Vedic Mathematics?

&nbsp&nbsp&nbsp&nbsp&nbsp Vedic Mathematics is the name given to the ancient system of Mathematics which was rediscovered from the Vedas between 1911 and 1918 by Sri Bharati Krsna Tirthaji (1884-1960). At the beginning of the twentieth century, when there was a great interest in the Sanskrit texts in Europe, Bharati Krsna Swamiji tells us some scholars ridiculed certain texts which were headed 'Ganita Sutras'- which means mathematics. They could find no mathematics in the translation and dismissed the texts as rubbish. Bharati Krsna Swamiji, who was himself a scholar of Sanskrit, Mathematics, History and Philosophy, studied these texts and after lengthy and careful investigation was able to reconstruct the mathematics of the Vedas. According to his research all of mathematics is based on sixteen Sutras, or word-formulae. &nbsp&nbsp&nbsp&nbsp&nbsp Bharati Krsna wrote sixteen volumes expounding the Vedic system but these were unaccountably lost and when the loss was confirmed in his final years he wrote a single book: Vedic Mathematics, currently available. It was published in 1965, five years after his death. The term Vedic Mathematics now refers to a set of sixteen mathematical formulae or sutras and their corollaries derived from the Vedas.

EKĀDHIKENA PŪRVEŅA

The Sutra (formula) Ekādhikena Pūrvena means:“By one more than the previous one”.

Now let us apply this sutra to the ‘squaring of numbers ending in 5’.Consider the example 25^2.

Here the number is 25. We have to find out the square of the number. For the number 25, the last digit is 5 and the 'previous' digit is 2. Hence, 'one more than the previous one', that is, 2+1=3. The Sutra, in this context, gives the procedure 'to multiply the previous digit 2 by one more than itself, that is, by 3. It becomes the L.H.S (left hand side) of the result, that is,2 X 3 = 6. The R.H.S (right hand side) of the result is 5^2, that is, 25.

Vulgar fractions whose denominators are numbers ending in NINE

We now take examples of 1 / a9, where a = 1, 2, -----, 9. In the conversion of such vulgar fractions into recurring decimals, Ekadhikena Purvena process can be effectively used both in division and multiplication.

Multiplication Method: Value of 1 / 19

First we recognize the last digit of the denominator of the type 1 / a9. Here the last digit is 9. For a fraction of the form in whose denominator 9 is the last digit, we take the case of 1 / 19 as follows: For 1 / 19, 'previous' of 19 is 1. And one more than of it is 1 + 1 = 2. Therefore 2 is the multiplier for the conversion.We write the last digit in the numerator as 1 and follow the steps leftwards.

NIKHILAM NAVATAS’CHARAMAM DASATAH

The formula simply means : “all from 9 and the last from 10”

The formula can be very effectively applied in multiplication of numbers, which are nearer to bases like 10, 100, 1000 i.e., to the powers of 10(eg: 96 x 98 or 102 x 104). The procedure of multiplication using the Nikhilam involves minimum number of steps, space, time saving and only mental calculation. The numbers taken can be either less or more than the base considered.

Case (i) : when both the numbers are lower than the base.Find 97 X 94. Here base is 100. Now following the rules, the working is as follows: 97 is 3 less than the nearest base 100. and 94 is 6 less than the same nearest base 100. Hence 3 and 6 are called deviations from the base. Always the base should be same for the two numbers. =91/18=9118Note: Here '/' signifies just a seperation and has nothing to do with division.In genreal, let N1 and N2 be two numbers near to a given base in powers of 10, and D1 and D2 are their respective deviations from the base. Then N1 X N2 can be represented as:Case ( ii) : When both the numbers are higher than the base.The method and rules follow as they are. The only difference is the positive deviation. Instead of cross – subtract, we follow cross – add.104 X 102. Base is 100.

Note: We are considering 04x02=08 and appending '08' and not just '4x2=8'. This is done because, we need to consider two digits in deviation as it the base 100 has two zeros. If the deviation is near 1000 then we need to consider 3 digits in the deviation (eg, 004 and not just 4).

Case ( iii ): One number is more and the other is less than the base.In this situation one deviation is positive and the other is negative. So the product of deviations becomes negative. So the right hand side of the answer obtained will therefore have to be subtracted. To have a clear representation and understanding a vinculum is used. It proceeds into normalization. 13 X 7. Base is 10

10/(-9)=91 how?

10/(-9) should be read as 'one zero, nine bar'. Here 'one' and 'zero' are in normal form. 'nine' is in complement form. so, when we bring a carry from normal form to complment form, '10' becomes '9' and '9-bar' becomes '1'( 10's complement of 9). Hence 10/(-9)-91.

ĀNURŨPYENA

The upa-Sutra 'Anurupyena' means 'proportionality' or 'similarly'. This Sutra is highly useful to find products of two numbers when both of them are near the Common bases like 50, 60, 200 etc(multiples of powers of 10).Example 1: 46 X 43As per the previous methods, if we select 100 as base we getThis is much more difficult and of no use.

Now by ‘Anurupyena’ we consider a different working base through we can solve the problem.Take the nearest higher multiple of 10. In this case it is 50.Treat it as 100 / 2 = 50. Now the steps are as follows:i) Choose the working base near to the numbers under consideration.i.e., working base is 100 / 2 = 50ii) Write the numbers one below the otheriii) Write the differences of the two numbers respectively from 50 against each number on right sideiv) Write cross-subtraction or cross- addition as the case may be under the line drawn. Multiply the differences and write the product in the left side of the answer.v) Since base is 100 / 2 = 50 , 39 in the answer represents 39X50.Hence divide 39 by 2 because 50 = 100 / 2Thus 39 ÷ 2 gives 19½ where 19 is quotient and 1 is remainder . This 1 as Reminder gives one 50 making the L.H.S of the answer 28 + 50 = 78(or Remainder ½ x 100 + 28 ) i.e. R.H.S. 19 and L.H.S. 78 together give the answer 1978.

URDHVA TIRYAGBHYAM

Urdhva – tiryagbhyam is the general formula applicable to all cases of multiplication and also in the division of a large number by another large number. It means “Vertically and cross wise.”Multiplication of two 2 digit numbers.

Ex.1: Find the product 14 X 12The symbols are operated from right to left .Step i) :

Step ii) :

Step iii) :

Let us work another problem by placing the carried over digits under the first row and proceed.

Adyamadyena-Antyamantyena

&nbsp &nbsp &nbsp The Sutra ' Adyamadyena-Antyamantyena' means 'the first by the first and the last by the last'.

&nbsp &nbsp Suppose we are asked to find out the area of a rectangular card board whose length and breadth are respectively 6ft . 4 inches and 5 ft. 8 inches. Generally we continue the problem like this.

Area = Length X Breath

By Vedic principles we proceed in the way "the first by first and the last by last"

i.e. 6’ 4" can be treated as 6x + 4 and 5’ 8" as 5x + 8,

Where x= 1ft. = 12 in; x2 is sq. ft.

Now ( 6x + 4 )(5x + 8 )

It is interesting to know that a mathematically untrained and even uneducated carpenter simply works in this way by mental argumentation. It goes in his mind like this

YAVDUNAM TAAVDUNIKRITYA VARGANCHA YOJAYET

This sutra means whatever the extent of its deficiency, lessen it still further to that very extent; and also set up the square of that deficiency. This sutra is very handy in calculating squares of numbers near(lesser) to powers of 10

For instance in computing the square of 98 we go through the following steps:1. The nearest power of 10 to 98 is 100.2. Therefore, let us take 100 as our base.3. Since 98 is 2 less than 100, we call 2 as the deficiency.4. Decrease the given number further by an amount equal to the deficiency.i.e., perform ( 98 -2 ) = 96. This is the left side of our answer!!.5. On the right hand side put the square of the deficiency, that is square of 2 = 04.6. Append the results from step 4 and 5 to get the result. Hence the answer is 9604.

Note: while calculating step 5, the number of digits in the squared number (04) should be equal to number of zeroes in the base(100). Hence in our case, the base 100 has 2 zeros and hence sqaure of 2 is 04 and not just 4.

Now consider another example: Calculate the square of 94. ( following the steps given above...)1. The neareset power of 10 to given number 94 is 1002. Hence the base is 1003. Deficiency = 64. Subtract the deficiency from the given number ( 94 - 6 ) = 885. Square of deficiency = 36 ( 2 digits)6. Append the results from step 4 and 5 to get the result. i.e., 8836

YAVADADHIKAM TAAVADAHIKIKRITYA VARGANCHA YOJAYET

This sutra means whatever the extent of its surplus, increment it still further to that very extent; and also set up the square of that surplus. This sutra is very useful in calculating the sqaures of numbers nearer(greater) to powers of 10.

For instance: in computing the square of 103 we go through the following steps:1. The nearest power of 10 to 103 is 100.2. Therefore, let us take 100 as our base.3. Since 103 is 3 more than 100(base), we call 3 as the surplus.4. Increase the given number further by an amount equal to the surplus. i.e., perform ( 103 + 3 ) = 106. This is the left side of our answer!!.5. On the right hand side put the square of the surplus, that is square of 3 = 09.6. Append the results from step 4 and 5 to get the result. Hence the answer is 10609.

Note: while calculating step 5, the number of digits in the squared number (09) should be equal to number of zeroes in the base(100). Hence in our case, the base 100 has 2 zeros and hence sqaure of 3 is 09 and not just 9.

Similarly if we need to calculate the square of 1009,1. The nearest power of 10 to 1009 is 1000.2. Therefore, let us take 1000 as our base.3. Since 1009 is 9 more than 1000(base), we call 9 as the surplus.4. Increase the given number further by an amount equal to the surplus. i.e., perform ( 1009 + 9 ) = 1018. This is the left side of our answer!!.5. On the right hand side put the square of the surplus, that is square of 9 = 081.(not just 81 !)6. Append the results from step 4 and 5 to get the result. Hence the answer is 1018081.

Try to find the square of 106 and 19 using this sutra.

Now here's a twist. What is sqaure of 112 using this rule? will this rule apply?Answer is Yes. But we need to stick to basics and use some common sense.Here we go...1. & 2. the base is 100.3. Surplus = 124. Increase the given number by surplus i.e. ( 112 + 12 ) = 1245. Square of surplus, 12 = 144 . Now what?

by rule we need to consider only 2 digits in step 5 ( as the base has 2 zeros )6. We have to append 124 and 144. The '1' in 144 becomes 'carry' to 124. Hence the result is (124 +1 ) appended with 44 i.e., 12544 is the result.

dont get confused. try this example to make yourself more confident.Find the square of 111. Now try to find the square of 10101.

ANTYAYOR DAŚAKE'PI

The Sutra simply means - numbers of which the last digits added up give 10.

This sutra is helpful in multiplying numbers whose last digits add up to 10(or powers of 10). The remaining digits of the numbers should be identical.

i.e. the Sutra works in multiplication of numbers for example:25 and 25, 2 is common and 5 + 5 = 1047 and 43, 4 is common and 7 + 3 = 1062 and 68,116 and 114.and also for 425 and 475

The last example can be looked as digit 4 being common and 25 and 75 add upto 100.

Note that in each case the sum of the last digit of first number to the last digit of second number is 10. Further the portion of digits or numbers left wards to the last digits remain the same. At that instant use Ekadhikena on left hand side digits. Multiplication of the last digits gives the right hand part of the answer.Example 1 : 57 X 53See the end digits sum 7 + 3 = 10 ; then by the sutras Antyayor dasakepi and Ekadhikena we have the answer.Ekadhikena to the remaining digits means, increment the remaining digits by 1 and multiply it with the same.57 x 53 = ( 5 + 1 )x5 / 7x3 ( the '/' is just a seperator and not a division mark)&nbsp = 30 / 21 = 3021.

It is further interesting to note that the same rule works when the sum of the last 2, last 3, last 4 - - - digits added respectively equal to 100, 1000, 10000 -- - - . The simple point to remember is to multiply each product by 10, 100, 1000, - - as the case may be . Your can observe that this is more convenient while working with the product of 3 digit numbers.Eg. 1: 292 x 208 Here 92 + 08 = 100, L.H.S portion is same i.e. 2 292 x 208 = ( 2 x 3 ) / 92 x 8 = 60 / 736 ( for 100 raise the L.H.S. product by 0 ) = 60736.

LOPANA STHÂPANÂBHYÂM

Lopana sthapanabhyam means 'by alternate elimination and retention'.

Consider the case of factorization of quadratic equation of type ax2 + by2 + cz2 + dxy + eyz + fzx. This is a homogeneous equation of second degree in three variables x, y, z. The sub-sutra removes the difficulty and makes the factorization simple. The steps are as follows:

i) Eliminate z by putting z = 0 and retain x and y and factorize thus obtained a quadratic in x and y by means of Adyamadyena sutra.

ii) Similarly eliminate y and retain x and z and factorize the quadratic in x and z.

iii) With these two sets of factors, fill in the gaps caused by the elimination process of z and y respectively. This gives actual factors of the expression.

GUNÌTA SAMUCCAYAH - SAMUCCAYA GUNÌTAH

In connection with factorization of quadratic expressions a sub-Sutra, viz. 'Gunita samuccayah-Samuccaya Gunitah' is useful.It is intended for the purpose of verifying the correctness of obtained answers in multiplications, divisions and factorizations.

It means in this context: 'The product of the sum of the coefficients(sc) in the factors is equal to the sum of the coefficients(sc) in the product'

Symbolically we represent as sc of the product = product of the sc (in the factors)/p>